Listjoij



einer@ y :gnlweiici mit inode :ai :meinen je in aonezaaq' e .inoriimoo eine eerzeie Ll ni-emana Mamiya wenn ai iiiiireiipe hbn alici/frer@ reame v israelita enf run al lnllnl .l ,zetofoi-,ezicomlaemetaltsensists principally l-'heftincsenersllyn ntains eene-telelens; i, a, adattamenti i., when? spe nsmacepnessursmiabnuiaankwam.

mcould be reached at a speed ofixgg/se,. wheregyzgi the bearing'temperature rose up to :100 C. gli

pounds w jmet Jo 35 usi'lliiinum aiioys result from the addition of metals which form with the aluminum none show any defects. y l or at least only few -hard compounds, thus result- 0n further investigation of these alloys it was ing in no damage being done to the f axle even shown that the lead and the antimony can bel vafter an extended time of working. Such addireplaced in part at least by one ofthe metals of 40 tions are antimony and leadwhich may be presthe group tin, cadmium, calcium and arsenic' in 'My ent in quantities up to 10% each. The antimony4 quantities of 0.1-5%. Thus, it is possible tomake fOlmS Wlh. aluminum the C0mPOUnd AlSb which use with equal success of an alloy of the following is present in the base alloys as bearing compocomposition; v y y l nent. Lead does not "combine with aluminum. f lPer cent According to the opinion of several experts ity pbl 1.5.

l is not soluble at all in the aluminum.f If alumi- Sn f f1 num be melted together with lead, at the time Sb .2.5'

of solidication a. separation of the aluminum A1 y ance and lead takes place, i. e., the lead is asinsoluble Y Bal z 50 in the aluminum as oil in water. By adding or Per egg 60 antimony to the aluminum this sharp separation 1gb 1 of lead from the aluminum is obviated, so that Sg iw with the presence of asuillcientquantity of A] Bal' antimony larger quantities of lead are distribance i utedin the aluminum, resultingin an alloy which In cases in vWhich the price of hearing metal '6.6'

is of lesserimportance. the tin content may also be higher. An alloy having a higher tin tothe-axle havingoccurred. Naturally with such content is about the following: l

Per cent Pb as si i 2.3 Bn n 5- Al Balance lo Since tin alloys weld either vwith antimony or to the ternary aluminum-lead-antimony-alloy, but also the other metals added to this threepart-alloy result in very useful bearing metals. u While the additional metals mentioned-above iniiuence chiefly the sliding properties, the further possible additions of at least one of the metals l of the group consisting of copper, nickel, cobalt,

iron, manganese and zinc in quantities of 0.1-10.%

and silicon in quantities of 0.l- 3%` especially effect va strengthening of thebearing metal which lconsequently is `more suitable to resist higherpressures. Especially an addition of manganese has proved very eilective,l inasmuch as it not only increases the hardness of the alloy. but even improves essentially the sliding properties. An

alloy thatfproved particularly useful for the autoi mobile motor is composed as follows: 2.5% Pb,

2.5% Sb, 3% Mn, remainder Al.

m Further alloys that correspond about to the properties of the above-mentioned alloys are as The addition of metals of aV higher melting point further serve the purpose oi: making the bearing 5 while 'it is correct `that with most of the additional metals named above the melting point of aluminum i`s lowered to the eutectic point, the presence of these metals havingV higher melting points, moreespecially if lead and tin with their lower meltingpoint are present, result in the direction of a better resistance to higher temperawith lead, it isparticularly valuable as addition..

i "the compound metal. sheets thus obtained espemetals capable of resisting higher temperatures.`

tures. Bearing temperatures -of upto 120 C. could be reached Vwithout a clinging or. `sticking high temperatures the higher heat expansion of the aluminum alloys has to be taken into account 5 by the provision of a greater bearing-play.

If the new bearing metals are used yunder favorable conditional. e., presence of `ample quantities of lubricants, they show but a small wear, even after a comparatively short running-in period. 10

Summing up, it may be said that with the new bearing metals having analuminum base as compared with the hitherto known `bearing metals,

the following advantages exist:

1. Easier running-in, 2. High resistance to wear,` 3j. Possibility oi' using unhardened axles,` n 4. High resistance to temperature.

The alloys may be used in\acco'rdance with the 20 invention for any casting method, as sand casting, chill casting, pressure die casting and centrifugal casting. With centrifugal casting the temperatures 'and numbers of .revolutions must be adlusted in suchy a way that the segregations remain` at a minimum. The alloys may further be pressed., forged'or rolled. In this respect it is surprising that the annealing in the drawing ci rods and tubes may be accomplished at about 500a c. in spite or yche iemiand mummy-content 3 without `a segregation of the alloys occurring thereby.

. I'hr the production of an alloy as uniform as possible, first of all antimony is melted together with aluminum whereupon lead is added as-such u or` as a preliminary alloy.

"I'he rollingpossibility moreover makes it'possible to roll up the alloys to a rmer sheet base that may. consist of iron or copper alloys or also of hardenable aluminum alloys and to produce from cially rm bearing shells. i

' 'This application is adivision of my Aclopendingv application, Serial No. 180,029, led December 15,

1937, now Patent No. 2,196,236, patented April l f 1. A bearing metal alloy containing about` 110 of lead, 1-10% of antimony, 0.1-3% of suicon and o.11o% or manganese. the `baleines 5 vbeing,substintiallyall aluminum..

2. A bearing metal may containing about 3% of lead, about 3% of antimony, about 0.3% 'of silicon, and from 1 to 3% of manganese, `the balancebeing substantially all aluminium l EUGEN VADEas. 

